© Semiconductor Components Industries, LLC, 2008
March, 2008 - Rev. 8
1 Publication Order Number:
CS2841B/D
CS2841B
Automotive Current Mode
PWM Control Circuit
The CS2841B provides all the necessary features to implement
off-line fixed frequency current-mode control with a minimum
number of external components.
The CS2841B (a variation of the CS2843A) is designed specifically
for use in automotive operation. The low start threshold voltage of 8.0 V
(typ), and the ability to survive 40 V automotive load dump transients
are important for automotive subsystem designs. The CS2841 series
has a history of quality and reliability in automotive applications.
The CS2841B incorporates a precision temperature-controlled
oscillator with an internally trimmed discharge current to minimize
variations in frequency. Duty-cycles greater than 50% are also
possible. On board logic ensures that V
REF
is stabilized before the
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
Features
•Optimized for Off-Line Control
•Internally Trimmed Temperature Compensated Oscillator
•Maximum Duty-Cycle Clamp
•V
REF
Stabilized Before Output Stage Enabled
•Low Start-Up Current
•Pulse-By-Pulse Current Limiting
•Improved Undervoltage Lockout
•Double Pulse Suppression
•1.0 % Trimmed Bandgap Reference
•High Current Totem Pole Output
•Pb-Free Packages are Available*
*For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
CS2841B = Device Code
A = Assembly Location
WL = Wafer Lot
YY, Y = Year
WW = Work Week
G = Pb-Free Package
PDIP-8
N SUFFIX
CASE 626
PIN CONNECTIONS AND
MARKING DIAGRAM
V
REF
V
CC
V
OUT
GND
COMP
V
FB
Sense
OSC
1
8
SOIC-14
D SUFFIX
CASE 751A
GND
OSC
PWR GND
NC
V
OUT
Sense
V
CC
PWR
NC
V
CC
V
FB
NC
NC
V
REF
COMP
1
14
SOIC-14
PDIP-8
http://onsemi.com
CS2841BEB
AWL
YYWWG
CS2841BD14G
AWLYWW
1
14
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
ORDERING INFORMATION
